US Patent 11851020 Selectively extendable seat airbag

An assembly including a vehicle seat. The assembly includes an airbag supported by the vehicle seat and inflatable to an inflated position. The airbag includes a main chamber elongated along an axis and an extension supported by the main chamber. The extension extends from the main chamber transverse to the axis in the inflated position. The main chamber includes a lower segment and an upper segment selectively extendable away from the lower segment along the axis from an unreleased position to a released position. The extension is supported by the upper segment of the main chamber and the extension is translatable along the axis with the main chamber from the unreleased position to the released position.